fork download
copy 
  1. #define _CRT_SECURE_NO_WARNINGS
  2. #include <float.h>
  3. #include <math.h>
  4. #include <stdio.h>
  5.  
  6. #define max(a,b) (((a)>(b))?(a):(b))
  7.  
  8. void dispf(float f)
  9. {
  10. 	char		str[32];
  11. 	char*		pc;
  12. 	unsigned char*	pf;
  13. 	int		i, b;
  14.  
  15. 	pf = (unsigned char*)&f;
  16. 	pc = str;
  17. 	for (i = 0; i < 4; i++) {
  18. 		for (b = 0; b < 8; b++) {
  19. 			*pc++ = '0'+((pf[3-i]>>(7-b))&1);
  20. 		}
  21. 	}
  22. 	printf("%.1s %.8s %.23s\n", str, str + 1, str + 9);
  23. 	printf("%.8E\n", f);
  24. 	printf("%f\n", f);
  25. }
  26.  
  27. int main()
  28. {
  29. 	char	s[32];
  30. 	float	a, b;
  31.  
  32. 	printf("a = 1970.199707\n");
  33. 	a = (float)1970.199707;
  34. 	dispf(a);
  35. 	sprintf(s, "%E", a);
  36. 	printf("b = %s\n", s);
  37. 	sscanf(s, "%E", &b);
  38. 	dispf(b);
  39. 	sprintf(s, "%.8E", a);
  40. 	printf("b = %s\n", s);
  41. 	sscanf(s, "%E", &b);
  42. 	dispf(b);
  43. 	return 0;
  44. }
  45.  
Success #stdin #stdout 0.01s 1676KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
a = 1970.199707
0 10001001 11101100100011001100100
1.97019971E+03
1970.199707
b = 1.970200E+03
0 10001001 11101100100011001100110
1.97019995E+03
1970.199951
b = 1.97019971E+03
0 10001001 11101100100011001100100
1.97019971E+03
1970.199707
https://ideone.com/LYHXd
language:
C (gcc 8.3)
created:
12 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!